Select Row Where Column 1 is Unique

I need help with a select statement.  I would like to have something like the SQL below, except only return values where the Project.JobNumber is unique.  I would like also to take the last ProjectStatus.StatusDate as the tie breaker.  Please let me know how this can be done.  Thanks!

SELECT        Project.JobNumber, ProjectStatus.StatusType, ProjectStatus.StatusDate, ProjectStatus.AssignDate, Project.ID, StatusType.Description
FROM            Project INNER JOIN
                         ProjectStatus ON Project.ID = ProjectStatus.ProjectID INNER JOIN
                         StatusType ON Project.Status = StatusType.ID AND ProjectStatus.StatusType = StatusType.ID
ORDER BY Project.JobNumber, ProjectStatus.StatusDate

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